[FFmpeg-user] Does the fast and accurate seeking work on rtmps streams ( used for resuming download ) ?

[Han Jiang]

thanks ! but i'm not sure what you mean, i'm very new to this. do you mean
write images out , so according to the frame name, i know exactly where am
i when download was interrupted ? then re-encode all the images?

currently i'm using

ffmpeg.exe -y -ss 00:29:00 -i "rtmps://xxx:443/vod/xx/mp4:xx/xx.mp4
swfUrl=xx playpath=mp4:xx.mp4" -ss 00:01:00 -c copy
/usr/tmp/tmp/xx.part.1.mp4

i was hoping this will give me the exact start time of 00:30:00 using fast
and accurate seeking,  i used -c copy ( i didn't want re-encoding here )

what is the pros and cons of this versus the method you mentioned ? thanks !


On Wed, Mar 12, 2014 at 11:08 AM, Renato Santos <renato.cron at gmail.com>wrote:

> Can't you use segment output format and do a "never end" recoding process
> that write a lot of precise duration files?
>
> The only thing is,, if you output in (dot)ts you may lose some frames, but
> if you re_encode in something again (and force Keyframes) You can split the
> stream easy
> On Mar 12, 2014 12:05 AM, "Han Jiang" <oglops at gmail.com> wrote:
>
> > hi all i'm downloading some long videos from a rtmps url, it works
> > perfectly but when network hiccups , download stopped before it finishes,
> > basically i want to check the already downloaded unfinished .mp4 video
> > length via ffprobe,  then pass -ss to the ffmpeg command line as the
> > wiki<
> >
> http://trac.ffmpeg.org/wiki/Seeking%20with%20FFmpeg#Fastandaccurateseeking
> > >suggested.
> > save another file, at last concatenate these files.
> >
> > the problem is the fast and accurate seeking seems not working . i used
> the
> > latest windows static 64bit build from
> > zeranoe<http://ffmpeg.zeranoe.com/builds/>
> >
> > fast seeking seems working : ( download starts immediately , seeking is
> > indeed "fast")
> >
> > ffmpeg -ss 00:30:00 -i "rtmps://xxx option=xxx" out.mp4
> >
> >
> > accurate seeking seems working too: ( download only start after 30min ,
> > it's slow )
> >
> > ffmpeg -i "rtmps://xxx option=xxx" -ss 00:30:00 out.mp4
> >
> >
> >
> > but the hybrid fast and accurate seeking is not working
> >
> > ffmpeg -ss 00:29:00 -i "rtmps://xxx option=xxx" -ss 00:01:00 out.mp4
> >
> > This is suggested by the wiki page, but it seems has no effect
> > (download still starts after 29min or 30min)
> >
> > am i missing something ?
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